In an acidic medium, the dichromate ion acts as an oxidizing agent and oxidizes the ferrous ion to ferric ion (Fe^3+), while itself gets reduced to chromium ion (Cr^3+). The reaction can be written as:
\[Cr_2O_7^{2-} + 6Fe^{2+} + 14H^+ \rightarrow 2Cr^{3+} +
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